VBFNLO LHE files not read

Asked by Philipp Pigard

Hello again

when trying to inlcude some samples generated with VBFNLO (most current version), I noticed that they are not read by MA, due to the header structure:

ERROR: No header has been found. The file is skipped.

I have copied a minimal lye after this message. I checked with the LHE standard definition and it appears that the VBFNLO file conforms to it.

One can "fix" this by replacing the VBFNLO header with one of a MG generated LHE file. Now is this a bug or does MA need some info from the header to properly function?

Thanks and cheers
Philipp

-----------------------------
Begin example lhe file:

<LesHouchesEvents version="1.0">
<!--
File generated with VBFNLO - parton level MC program (LO)

 pp -> Z Z jj -> l+ l- l+ l- jj

Z pair + 2 jets production in vector boson fusion with decay into charged
leptons.
The Higgs contribution is included.
Process is implemented at LO and NLO QCD.
This process can be run in the AdS Higgsless and Three-Site Higgsless scenarios using:
   "kk_input.dat" or "kk_coupl_inp.dat".
Anomalous couplings can be set in "anomV.dat".
This process can be run in spin-2 models using:
   "spin2coupl.dat"
References: B. Jager, C. Oleari, D. Zeppenfeld
Phys. Rev. D73 (2006) 113006, e-Print: hep-ph/0604200
C. Englert diploma thesis
e-Print: http://www-itp.particle.uni-karlsruhe.de/prep/diploma/PSFiles/Diplom_Englert.ps.gz
For Spin-2:
J. Frank, M. Rauch and D. Zeppenfeld,
Phys.Rev.D87, 055020 (2013) [arXiv:1211.3658 [hep-ph]],
J. Frank diploma thesis
e-Print: www-itp.particle.uni-karlsruhe.de/prep/diploma/PSFiles/Diplom_Frank.pdf

-->
<init>
    2212 2212 7.000000E+03 7.000000E+03 0 0 21000 21000 3 1
  3.272800E-05 4.535553E-07 1.000000E+00 210
</init>
<event>
    10 210 1.000000E+00 2.129133E+02 7.556254E-03 1.299238E-01
       3 -1 0 0 501 0 0.0000000000E+00 0.0000000000E+00 1.9692133171E+03 1.9692133171E+03 0.0000000000E+00 0.0E+00 9.0E+00
       2 -1 0 0 502 0 0.0000000000E+00 0.0000000000E+00 -1.8817151998E+03 1.8817151998E+03 0.0000000000E+00 0.0E+00 9.0E+00
       4 1 1 2 501 0 -2.6310450894E+01 -1.3612103506E+02 1.9304951777E+03 1.9354670773E+03 0.0000000000E+00 0.0E+00 9.0E+00
       1 1 1 2 502 0 1.5768812612E+02 8.5630429620E+01 -1.3305077385E+03 1.3425531489E+03 0.0000000000E+00 0.0E+00 9.0E+00
      23 2 1 2 0 0 -9.6347249254E+01 1.1226137745E+01 -1.6236130969E+02 2.0810161088E+02 8.6811675247E+01 0.0E+00 9.0E+00
      23 2 1 2 0 0 -3.5030425969E+01 3.9264467699E+01 -3.5012801224E+02 3.6480667979E+02 8.7894593091E+01 0.0E+00 9.0E+00
     -11 1 5 0 0 0 -5.8577136629E+01 -3.1075841330E+01 -5.2913296254E+01 8.4833989476E+01 0.0000000000E+00 0.0E+00 -1.0E+00
      11 1 5 0 0 0 -3.7770112624E+01 4.2301979075E+01 -1.0944801344E+02 1.2326762141E+02 0.0000000000E+00 0.0E+00 1.0E+00
     -13 1 6 0 0 0 -4.9862064186E+01 -1.0040828577E+01 -1.6631575640E+02 1.7391944833E+02 0.0000000000E+00 0.0E+00 -1.0E+00
      13 1 6 0 0 0 1.4831638217E+01 4.9305296276E+01 -1.8381225584E+02 1.9088723145E+02 0.0000000000E+00 0.0E+00 1.0E+00
</event>
</LesHouchesEvents>

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Solved by:
Benjamin Fuks
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Revision history for this message
Best Benjamin Fuks (fuks) said :
#1

Hi Philipp,

This is now fixed both in v1.1.10 and v1.1.11beta. The LHE reader was requiring the presence of headers, although those are optional according to LHE standards. Thanks for bringing this to our attention.

Best regards,

Benjamin

Revision history for this message
Philipp Pigard (p-pigard) said :
#2

Thanks Benjamin Fuks, that solved my question.